you are going to need a lot of parts, starting with the bell housing. for your engine you can two different bell housings, the 67-79 bell housing which has the proper pattern to both bolt to your engine, and allows the trans to bolt up. the other bell housing you can use is the 66 and earlier bell housing, but you need a 2.77 to 3.03 adapter.
you need the clutch, flywheel, clutch linkage, clutch pedal, shifter,pilot bushing, and a few sundry items i cant think of right now. most of these parts are easy to find, others are difficult at best. when you get a flywheel you will want the flat flywheel not the one that has a recess built in as finding the clutch disc and pressure plate for the larger clutch are easier to find.
edit: you can not use the bell housing or the flywheel from a 250 as they will NOT fit the 200. two good sources of information are the falcon six cylinder performance handbook available from www.classicinlines.com
and amazon.com, and the forums at www.fordsix.com
if/when you decide to hot rod your six, definitely check out the forums at www.fordsix.com
we even have a section devoted to mavericks.